Calculator.



No. 809,294. PATENTED JAN. 9, 1906.

' S. S. FRY.

CALCULATOR. APPLICATION PM?) MAR.27. 1905.

w vtnmaeo awn-meg UNITED STATES PATENT oEEIGE.

CALCULATOR- Specification of Letters Patent.

Patented Jan. 9, 1906.

Application filed March 27, 1905. Serial No. 252,369.

To aZZ whom, it may concern.-

Be it known that I, SPEED S. FRY, 'a citizen of the United States ofAmerica, residing at Breckenridge, in the county of Summit and State ofColorado, have invented certain new and useful Improvements inCalculators, of which the following is a specification.

This invention relates to calculators, and more particularly to thatclass employed in multiplying.

It has for an object the provision of novel arrangement of parts wherebythe result of two numbers of constant or frequent use can be easily andreadily obtained.

It is also an objectv of this invention to produce a device of this kindin which two disks are emploved, one of said disks carrying themultiplicand and result, while the other disk carries the multiplier andmeans whereby the result is identified.

I/Vith the foregoing and other objects in view the invention consists inthe details of construction and in the arrangement and combination ofparts, to be hereinafter more fully set forth and claimed.

In describing the invention in detail reference will be had to theaccompanying drawings, forming part of this specification, wherein likecharacters denote like and corresponding parts in the several views, inwhich Figure 1 is a top plan view of the invention. Fig. 2 is a top planview of the multiplicand-disk, va portion of the results being omitted.Fig. 3 is a plan view in fragment of the multipler-disk. Fig. 4 is asectional view taken on the line 4 4 of Fig. 1.

In the drawings, a indicates a bottom disk of suitable diameter, and b asecond disk of less diameter. The two disks are centrally pivoted one tothe other by means of the pin 0 or the like. The two disks are free torotate independently, and to guard them against wear caused by the pin 0suitable protecting-plates cl are interposed between the heads of thepin and the disks.

Around the edge of the disk (1 are positioned series of numbers 6 and eto be multiplied, (the multiplicand,) and around the edge of the disk?)are arranged the numbers to be multiplied, as the multiplier. Each ofthe series of multiplicands is in duplicate, and one series isdistinguished from the other by different coloring or formation of thefigures. The multipliers are also divided into two seriesf and fpreferably of equal number, but not in duplicate. These aredistinguished either by suitable coloring or formation, but the identityof the multiplier series must coincide with the identity of themultiplicand series. Arranged beneath each multiplicand on a radial linetherewith is a series of numbers g and g, which are the same in color orformation as the multiplicands. These numbers, the results of themultiplicand and of all the multipliers of the same identity, arearranged in such a manner that all the results of one multiplier are ina segment concentric with the multiplicands.

The disk I) is provided with a plurality of apertures which are arrangedbeneath each multiplier and so positioned that the aperture of eachmultiplier coincides with the circle of results of that multiplier.These apertures are divided into series reversely and spirally arranged,one series of apertures acting in conjunction with coinciding series ofnumbers. By this arrangement advantageous results can be obtained bymaking the device comparatively small, while the num bers thereon do nothave to be reduced in size. Thus it can be seen that when it is desiredto multiply two numbers on the disk it is but necessary to turn one orboth of the disks on the pivot until the numbers to be multiplied are inradial alinement, when the aperture of the multiplier-disk will registerwith the result of the two numbers.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is

In a device of the character described, a disk having a series ofnumbers in duplicate around its edge, of different identities, eachnumber having arranged therebeneath on a radial line, series of numbersof the same identity, a second disk pivoted to the firstnamed disk, saiddisks having series of reversely and spirally arranged apertures, saidIn testimony whereof I aflix my signature, in the presence of tWoWitnesses, this 22d day 10 of March, 1905.

SPEED S. FRY.

Witnesses GEO. F. FoRMAN, WV. W. WHARTON.

